I think that it's been awhile since the tekkit reset and now people would like to come back to Hack/Mine. You can see this with many people going to try the pvp server also. A new update recently came(0.6) and adds many new things, some of which are SMP only. These include the random mob spawn kick bugs and the Proxy area glitches that I myself found quite annoying. Hopefully others think the same and miss going on Hack/mine also so it can come back.

jw as i have never really played h/m, is it not quite similar to the pvp server we are running now, they both have leveling systems but i have heard there is also some terrain stuff/mobs from h/m. could you elaborate some details about this to me please

From playing single player they have special mobs (roflconda is one example which is like a creeper snake type thing, raptor is another), special locations (dungeons/towers filled with mobs and at the end generally treasure), special weapons (with different effects like poison, extra dmg, etc)

Beyond what Persefani has said there is also a much more advanced trading system with the villagers and a currency. There are 4 different species you can choose. They don't change anything except POV and appearance but it is very cool for multiplayer. You can be 1 of 3 different classes, including warrior, ranger, and mage. rangers are able to clim up trees and cliffs and have many arrow abilities like lightning arrows and explosive arrows. Mages focus on wands and have a teleporting ability and a few other magical abilities. I've never played as Warrior before but i think they get more HP for each point they put in fortitude and they have a charge ability. On each level up you get 5 points to spend on 5 different skills. Strength increases melee damage, Dexterity increases bow damage and crit chance, Wisdom increases max mana, while Intelligence increases wand damage(widsom and intelligence might be vice versa) and Fortitude increases your max health. There are new biomes added like an evil forest or evil plain and the dungeons can include tricks or puzzles like certain portions of the wall that can be broken. Most dungeons walls are unable to be broken like bedrock.

If the Hack/Mine server is gone, I will most certainly be on less (not that I can really get on atm anyway T_T ). I prefer adventuring with friends to endless mining and crafting contraptions, and I miss the awesome things we were gonna do! Please bring it back!